cinch vs girth

cinch and girth both are nouns.

Word	Noun	Adjective	Verb	Adverb
cinch	Yes	No	Yes	No
girth	Yes	No	Yes	No

As nouns, cinch and girth are synonyms defined as:

cinch and girth: stable gear consisting of a band around a horse's belly that holds the saddle in place

As verbs, cinch and girth are synonyms defined as:

cinch (noun)	girth (noun)
a form of all fours in which the players bid for the privilege of naming trumps	stable gear consisting of a band around a horse's belly that holds the saddle in place
any undertaking that is easy to do	the distance around a person's body
stable gear consisting of a band around a horse's belly that holds the saddle in place